Muffler.



No. 756,203. Y PATBNTED APR.5,1904Q o. B. BARTHRL.

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PATENT OFFICE.

OLIVER E. BARTHEL, OF DETROIT, MICHIGAN.

MUFFLER.

SPECIFICATION forming part/of Letters Patent N0. 756,203, dated April 5, 1.904.

Application flied November 14,1903. serinNo. 181,129. (No moan.)

To all whom it may concer-71,:

Be it known that I, OLIVER E. BARTHEL, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and usefulImprovements in M-uiers, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvements in devices for deadening or muffling the noise caused by the escape or discharge of the exhaust of engines into the open air; and its object is to provide a simple, cheap, and very eflicient device for the purpose, having certain other new and useful features and the particular construction and combination of parts, all as hereinafter more fully described, reference being hadto the accompanyingdrawings, in which# Figure 1 is a longitudinal section of a device embodying the invention, and Figs. 2, 3,

and 4 are similar views showing modified con-l structions.

A represents the exhaust-pipe of an engine, and B the casing of the muiiier, consisting of a cylindrical body portion 1, formed of sheet metal, and two opposing heads 2 and 3, formed with short inwardly-projecting anges 4 to engage the outer side of the sheet-metal body. The head 2 is formed conical, with an inletopening 5 at the apex or axis, which is screwthreaded to receive the screw-threaded end of the exhaust-pipe A, and the head 3 is provided with an axial screw-threaded opening 6 to receive the screw-threaded end of the tubular exhaust member 7, which is provided with openings 8 in its sides. A circular deflector-plate 9 is formed conical and at its back or concave side is provided with a screwthreaded socket to receive the opposite screwthreaded end of the exhaust member 7 The deiiector is supported within the casing at a short distance from the head2, with its conical side opposing the inlet-opening and its apex in the axis of said opening, by bolts 10, secured in openings in the deiector, which extend through openings in the head 2 and are provided with nuts 11 on their outer ends, which when turned up against the outer face of the head draw the deiiector toward the the ends of the body and the parts all held rmly in position. The deflector forms a wall dividing the space within the casing into two chambers 12 and 13 of unequal capacity, the

casing being so proportioned relative to the size of the engine-cylinder and exhaust-pipe that the chamber 12, together with said pipe, has' greater cubic capacity than the cylinder, and the capacity of the chamber 13 is several times that of the chamber 12. These chambers communicate with each other through a restricted passage 14 at the periphery of the deflector, the diameter of the deflector being slightly less than the inside diameter ofv the casing; but as the diameter of the deiiector is so much greater than the diameter of the inlet or pipe A the area of said passage is approximately equal to that of the inlet, though very narrow. The exhaust upon entering the chamber 12 is moving with great rapidity and force and striking the deiector expends some of its force thereon and is deiccted thereby in all directions toward the passage 14, through which it passes into the chamber 13, where it expands before passing out intothe atmosphere through the openings in the exhaustpipe, which is open at its outer end. By rea-v son of the conical form of the deiector it is not vibrated by the impact of the exhaust, and therefore no sound is produced thereby.

By placing the conical deflector, having a large area,squarely in the path ofthe outgoing exhaust to receive its impact and deiiect and divide the same, thus depriving it of much of its force, and by then causing the exhaust to pass through the narrow passage, which has a capacity approximately equal to that of the exhaust-pipe, thus causing it to pass in a thin sheet into the chamber at the opposite end of the deflector.v with practically an even iow, where it is allowed to expand, the pulsation caused by the sudden expulsion of each succeedin g cylinder charge is entirely eliminated, and the exhaust will pass out through the eX- haust-pipe with a steady flow, the force of which is again reduced by passing through the openings in the side of said pipe and will not roo set up vibrations sufficient to produce any disagreeable noise.

In the construction shown in Fig. 2 the defiector 9 is omitted and the head 15, at the exhaust end of the cylinder, is made conical to receive the impact of the incoming charge and deliect the same outward toward the hollow stay-bolts 16, which are substitued for the bolts 10. These stays 16 extend through both heads andare provided with nuts on their outer ends to draw the heads toward each othei` and clamp the body between. Small openings 17 in the sides of these stays admit the exhaust to their interior, from whence it passes out through their open ends to the atmosphere. These hollow stay-bolts thus form exhaustpassages and also serve to bind the parts together.

Fig. 3 shows a modified form in which the casing is provided with a conical head 15, secured in place by the hollow stay-bolts 16, having the openings 17, and on the head is a screwthreaded iiange 18 to receive the screw-threaded end of a tubular member 19, which extends to within a short distance of the opposite head and forms a narrow passage 20. The exhaust-pipe A is extended inward by the extension 21 to within a very short distance of the head 15, with the apex of said head in the axis of said pipe 21. The exhaust entering through the pipes A and 21 strikes the conical head and is deflected thereby down the tubular member 19 and passes out through the passage 2O into the body of the casing, where it expands and passes out through the tubular stay-bolts.

In Fig. 4 is shown a casing formed with a cylindrical body portion engaged at its ends by two flat heads 22 and 23, provided with axial screw-threaded openings, the opening in the head 22 to receive a pipe 24, similar to the pipe 21 in Fig. 3, forming a continuation of the exhaust-pipe, and the opening in the head 23 to receive the screw-threaded end of a tubular exhaust member 25, similar to the mem ber 7 of Fig. 1. The head 22 is formed with an inwardly-extending tubular portion 26 internally screw-threaded at its inner end to receive a screw-threaded flange on the conical defiector 27, and in the sides ofl said member- 26 adjacent to the head 22 are formed open ings 28 to allow the exhaust to escape laterally after passing through the member 26. A laterally-extending flange 29 on the member 26 extends outward to near the body of the casing to f'orm a narrow passage 30 between its periphery and the wall of the casing. The exhaust entering through the pipe 24 strikes the head 27 and is deflected thereby down the tubular member 26. It then passes out through the small opening' 28, thence out through the narrow passage 30 into the body of the casing, where it expands, and then passes out through the openings in the exhaust member 25.

As shown in Fig. 1, 31 is a sheet of asbestos or other suitable material which .is wrapped around the body o't` the casing to deaden the sound, and turns of wire 32 are interposed between the sheet and body to forman airspace 33 and further assist in preventing noise. These wires not only hold the asbestos away from the body to form the air-space, but they also strengthen the body, and smaller wire 34 is wrapped around the outside ot' the sheet to hold the same in place. In Fig. 2 the asbestos is shown as wrapped around the body in contact therewith, the wires 32 being omitted.

Having thus fully described my invention, what I claim is- 1. In an exhaust-muffler, the combination of a casing having an inlet-opening, a conical deflector opposing the inlet-opening and a tubular exhaust member forming means tor sccuring the deflector in place and provided with openings in its side and an open outer end for the escape of the exhaust.

2. In an exhaust-muflier, the combination of a casing consisting of a body portion and opposing heads engaging said body provided with an inlet-opening', a conical deflector within the casing adjacent to the inlet-opening and opposing the same and means for securing the heads to the body and for holding the deflec tor in place consisting of' a tubular exhaust member opening through one o3t` said heads and provided with openings in its sides.

3. In an exhaust-muffler, the combination with a casing having an inlet and an exhaust passage, ot' a detlector within the casing provided with a conical side adjacent to the inlet and dividing the space within the casing into a relatively small and a large chamber with a restricted passage between its outer edge and the wall of the easing connecting said chambers.

4. In an exhaust-mufiier, the combination with a easing provided with an inlet at one end and an outlet at its opposite end, ot' a member supported within the casing near the inlet end thereof with a narrow passage between its outer edge and the wall oit the casing and dividing the casing into two chambers of unequal capacity.

5. In an exhaust-muflier, the combination with a casing provided with an inlet at one end and an outlet at its opposite end, of a conical deflector supported within the casing adjacent to the inlet with its apex in the axis o't' the inlet-opening and with a narrow passage between its outer edge and the wall of the casing.

6. In a muffler, the combination of a casing consisting of a body portion and opposing heads having an inletopening, a conical deiector supported within said casing adjacent to the head having the inlet-opening with a restricted passage between its edge and the wall of the body, and a tubular exhaust mem- IOO ber having openings in its sides between the deiiector and the other head and opening through said head.

7. In a muffler, the combination of a casing provided with an inlet-opening, a conical delector supported within said casing with a narrow passage between its edge and the wall of the casing and opposing the inlet-opening,

atubular exhaust member provided with openings in its sides and having an open end extending through the casing and engaged and closed by the deiiector at its opposite end.

8. In a muilier, the combination of a casing consisting of a body portion and heads engaging said body, one of which heads is provided with an inlet-opening, a conical delector opposing the inlet-opening and secured to the head provided with said opening, a tubular exhaust member provided with openings in its side and secured at one end tothe deflector and at its opposite end' to the head opposing that to which the deflector is secured to secure the heads to the body.

9. In a muffler, the combination of a casing consisting of Aa body portion and opposing heads, one of which is provided with an inletopening, a conical deiector supported within the casing adjacent to the head having theinlet-opening with a narrow passage between its edge and the wall of the casing, an exhausttube having openings in its side secured at its inner end to the delector and at its open outer end within an opening in the head of the casing, and bolts to hold the heads in engagement with the body and support the deflector.

10. In an exhaust-muiier, the combination with a cylindrical casing having an inlet and an exhaust opening, of a covering of noncombustible material for said casing, and turns of wire interposed between the casing and covering to form an air-space.

11. In an exhaust-muffler, the combination of a cylindrical casing consisting of a body portion formed of sheet metal and heads to engage the body provided with .an inlet and an exhaust opening, a sheet of non-combustible material wrapped around said body, and

wire bands interposed between the sheet and body to strengthen the body and Jrorm an airspace.

12. In an exhaust-muffler, the combination of a cylindrical body portion, a head to receive one end of the body and provided with an axial inlet-opening, a head to receive the opposite end of .said body and provided with an axial screw-threaded opening, a circular deflector supported within the casing with a narrow passage between its edge and the wall of the body and formed with a conical side opposing the inlet and with a screw-threaded socket at its opposite side, an open-ended tubular exhaust member screw-threaded at its opposite ends to engage the socket on the deliector and the screw-threaded. opening in the head'and having openings in its side, and bolts secured at their inner ends to the deflector and extending through the head having the inlet to hold the heads and deiiector in place.

13. In an exhaust-muffler, the combination of a casing consisting of a body portion and heads engaging the ends of said body, one of which heads is provided with an inlet-opening, and a tubular exhaust member provided with openings in its side attached at one end to the head having the inlet and secured to and opening through the opposite head at its opposite end to secure the heads to the body.

14. In an exhaust-muflier, the combination of a casing consisting of a body portion and heads engaging the ends of said body, one of which heads is provided with an inlet-opening, means in the casing adjacent to the inletopening and in the path of the incoming exhaust for dividing and spreading said exhaust, and a tubular exhaust member having openings in its side, supporting said means and opening through the casing-head.

In testimony whereof I affix my signature in presence of two witnesses.

OLIVER E. BARTHEL.

Vitnesses:

OTTO F. BARTHEL, Lnwis E. FLANDERs. 

